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Motorola CP160 Detailed Service Manual
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Motorola CP160 Detailed Service Manual

Commercial series
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Commercial Series
CP140/CP160/CP180
Portable Radios
Detailed Service Manual
6866550D20-O

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  • Page 1 Commercial Series CP140/CP160/CP180 Portable Radios Detailed Service Manual 6866550D20-O...
  • Page 3 Commercial Series CP140/CP160/CP180 Portable Radios Detailed Service Manual 6866550D20-O Contents Section 1 Service Maintainability Section 2 Power Distribution, Controller and Keypad Service Information Section 3 VHF Service Information Section 4 UHF1 Service Information Section 5 UHF2 Service Information Section 6 UHF3 Service Information WLS EMEA Publications Department, Jays Close, Viables Industrial Estate, Basingstoke, Hampshire, RG22 4PD, UK.

  • Page 5: Issue : December

    Commercial Series CP140/CP160/CP180 Portable Radios Service Maintainability Issue: December 2003...
  • Page 6 Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola...

  • Page 7: Safety Information

    This document includes useful information about RF exposure and helpful instructions on how to control RF exposures. Motorola radios are designed and tested to comply with a number of national and international standards and guidelines regarding human exposure to radio frequency electromagnetic energy. This radio complies with IEEE and ICNIRP exposure limits for occupational/controlled RF exposure environments at usage factors of up to 50% talk–50% listen.
  • Page 8 Keeping the radio at a proper distance is important since RF exposures decrease with distance from the antenna. For body-worn operation, always place the radio in a Motorola approved clip, holder, holster, case, or body harness for this product. Using Motorola non-approved accessories may result in exposure levels which exceed the occupational /controlled environment RF exposure limits.
  • Page 9 ELECTROMAGNETIC INTERFERENCE/COMPATIBILITY NOTE: Nearly every electronic device is susceptible to electromagnetic interference (EMI) if inadequately shielded, designed or otherwise configured for electromagnetic compatibility. Facilities To avoid electromagnetic interference and/or compatibility conflicts, turn off your radio in any facility where posted notices instruct you to do so. Hospitals or health care facilities may be using equipment that is sensitive to external RF energy.

  • Page 10: Operational Warnings

    OPERATIONAL WARNINGS Vehicles with an air bag WARNING: Do not place a portable radio in the area over an air bag or in the air bag deployment area. Air bags inflate with great force. If a portable radio is placed in the air bag deployment area and the air bag inflates, the radio may be propelled with great force and cause serious injury to occupants of the vehicle.

  • Page 11: Table Of Contents

    Table of Contents Chapter 1 INTRODUCTION 1.0 Scope of Manual ....................1-1 2.0 Warranty and Service Support................1-1 2.1 Warranty Period and Return Instructions ............1-1 2.2 After Warranty Period ..................1-1 2.3 European Radio Support Centre (ERSC)............1-2 2.4 Parts Identification and Ordering ..............1-2 2.5 EMEA Test Equipment Support..............1-2 2.6 Technical Support...................1-3 2.7 Related Documents ..................1-3...
  • Page 12 viii...

  • Page 13: Chapter 1 Introduction

    In instances where the product is covered under a "return for replacement" or "return for repair" warranty, a check of the product should be performed prior to shipping the unit back to Motorola. This is to ensure that the product has been correctly programmed or has not been subjected to damage outside the terms of the warranty.

  • Page 14: European Radio Support Centre (Ersc)

    Aftermarket and Accessory Division (AAD). If no part number is assigned, the part is not normally available from Motorola. If the part number is appended with an asterisk, the part is serviceable by Motorola Depot only. If a parts list is not included, this generally means that no user-serviceable parts are available for that kit or assembly.

  • Page 15: Technical Support

    Warranty and Service Support Technical Support Motorola Product Services is available to assist the dealer/distributors in resolving any malfunctions which may be encountered. UK/Ireland - Richard Russell Telephone: +44 (0) 1256 488 082 Fax: +44 01256 488 080 Email: BRR001@email.mot.com...

  • Page 16: Radio Model Information

    INTRODUCTION Radio Model Information The model number and serial number are located on a label attached to the back of your radio. You can determine the RF output power, frequency band, protocols, and physical packages. The example below shows one mobile radio model number and its specific characteristics. Table 1-1 Radio Model Number (Example: MDH65KDC9AA2_N) Type of Model...

  • Page 17: Chapter 2 Maintenance

    Chapter 2 MAINTENANCE Introduction This chapter of the manual describes: preventive maintenance safe handling of CMOS devices repair procedures and techniques Preventive Maintenance The radios do not require a scheduled preventive maintenance program; however, periodic visual inspection and cleaning is recommended. Inspection Check that the external surfaces of the radio are clean, and that all external controls and switches are functional.

  • Page 18: Safe Handling Of Cmos And Ldmos

    When damaged parts are replaced, identical parts should be used. If the identical replacement component is not locally available, check the parts list for the proper Motorola part number and order the component from the nearest Motorola Communications parts center listed in the “Piece Parts”...
  • Page 19 General Repair Procedures and Techniques Chip Components Use either the RLN4062 Hot-Air Repair Station or the Motorola 0180381B45 Repair Station for chip component replacement. When using the 0180381B45 Repair Station, select the TJ-65 mini- thermojet hand piece. On either unit, adjust the temperature control to 370 °C (700 °F), and adjust the airflow to a minimum setting.
  • Page 20 MAINTENANCE Shields Removing and replacing shields will be done with the R1070 station with the temperature control set to approximately 215°C (415°F) [230°C (445°F) maximum]. To remove the shield: Place the circuit board in the R1070 circuit board holder. Select the proper heat focus head and attach it to the heater chimney. Add solder paste flux around the base of the shield.

  • Page 21: Notes For All Schematics And Circuit Boards

    (pF) or microfarads (µF), and inductance values are in nanohenries (nH) or microhenries (µH). DC voltages are measured from point indicated to chassis ground using a Motorola DC multimeter or equivalent. If the board has been removed from the chassis, the transmitter module mounting screws may be used for ground connection.
  • Page 22 MAINTENANCE Circuit Block Interconnection Legend: Name Description USWB+ Unswitched Battery Voltage (always on) 5 volts (regulated) 5 volts in RX mode only 5 volts in TX mode only RESET Low-line reset signal from U320 to uP D3_3V Digital 3.3 volts (regulated) Analog 3 volts (regulated) TX_ENA Transmit enable signal from uP to transmitter...

  • Page 23: Chapter 3 Service Aids

    Table 3.1 lists the service aids recommended for working on the radio. While all of these items are available from Motorola, most are standard workshop equipment items, and any equivalent item capable of the same performance may be substituted for the item listed.

  • Page 24: Test Equipment

    1010041A86 Solder (RMA type) 63/37, 0.5mm diameter, 1lb. spool. Test Equipment Table 3-2 lists test equipment required to service the radio and other two-way radios. Table 3-2 Recommended Test Equipment Motorola Part No. Description Characteristics Application R2600 series System analyzer...
  • Page 25 Commercial Series CP140/CP160/CP180 Portable Radios Power Distribution, Controller and Keypad Service Information Issue: December 2003...
  • Page 26 Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola...
  • Page 27 Table of Contents Chapter 1 THEORY OF OPERATION 1.0 Overview......................1-1 2.0 Radio Power Distribution ..................1-1 3.0 Controller Circuits ....................1-3 3.1 General ......................1-3 3.2 Microprocessor Circuitry ................1-4 3.3 Audio Circuitry....................1-8 3.4 Keypad ......................1-11 3.5 Speaker and Microphone ................1-11 3.6 LCD Display Module ..................

  • Page 29: Overview

    Chapter 1 THEORY OF OPERATION Overview This chapter provides a detailed theory of operation for the controller circuits in the radio. The components of these circuits are contained on the Main Board. Refer to the RF sections of this manual for the component location details and the parts lists of the Controller Circuits. This chapter also provides details of the keypad/display and the microphone and speaker connections.
  • Page 30 THEORY OF OPERATION When the radio is turned on, SWB+ is present and is applied to: transistor switch Q494 (pins 1 and 6) which turns on Q493 RX audio power amplifier U490 voltage divider R420/R421 and port PE0, a microprocessor A/D input which measures battery voltage and radio on/off status The output of FET switch Q493 is applied to the control pins of regulators U310, U320 and U330, turning them on.

  • Page 31: Controller Circuits

    Controller Circuits Controller Circuits General The controller board is the central interface between the various subsystems of the radio. It provides the following functions: interface with controls and indicators serial bus control of major radio circuit blocks encoding and/or decoding of selective signaling formats such as PL, DPL, MDC1200 and QuikCall II interface to CPS programming via the microphone connector storage of customer-specific information such as channel frequencies, scan lists, and...

  • Page 32: Microprocessor Circuitry

    THEORY OF OPERATION Microprocessor Circuitry The microprocessor circuitry includes microprocessor (U401) and associated EEPROM and Flash ROM memories. The following memory IC's are used: Table 1-2 Radio Memory Requirements Reference No. Description Type Size U402 Serial EEPROM AT25128 16K x 8 U403 Static RAM (not used)
  • Page 33 Controller Circuits 3.2.3 Serial Bus Control of Circuit Blocks The microprocessor communicates with other circuit blocks via a SPI (serial peripheral interface) bus using ports PD2 (data into uP), PD3 (data out of uP) and PD4 (clock). The signal names and microprocessor ports are defined in Table 1-3.
  • Page 34 THEORY OF OPERATION 3.2.6 Sensing of Externally-Connected Accessories Port PJ1 is used to detect the presence of externally connected accessories. Port PJ1 (U401 pin 72) is normally low, unless accessories (lapel speaker microphone, lightweight headset, etc.) are used with the radio. This port is used to detect an accessory PTT or auto sensing of a VOX accessory.
  • Page 35 Controller Circuits 3.2.9 Microprocessor 7.3975 MHz Clock The 7.3975 MHz clock signal (uP_CLK) is provided from the ASFIC_CMP (U451 pin 28). Upon startup the 16.8MHz crystal provides the signal to the ASFIC_CMP, which sends out the uP_CLK at 3.8MHz until a steady-state condition is reached and the clock is increased to 7.3975MHz for the microprocessor.

  • Page 36: Audio Circuitry

    THEORY OF OPERATION Audio Circuitry 3.3.1 Transmit and Receive Low-Level Audio Circuitry The majority of RX and TX audio processing is performed by U451, the Audio Filter IC (ASFIC_CMP), which provides the following functions: Tone PL/Digital PL encoding and decode filtering Tone PL/Digital PL rejection filter in RX audio path TX pre-emphasis amplifier TX audio modulation limiter...
  • Page 37 The Motorola RLN4460 Portable Test Set and AAPMKN4004 Programming Test Cable provide the proper interface between the radio's ungrounded audio output and ground-referenced test equipment.
  • Page 38 1-10 THEORY OF OPERATION 3.3.6 Battery Charging Through Microphone Jack A wall-type charging power supply may be connected to the 2.5 mm microphone jack (part of accessory connector J451). The voltage present at the tip contact (pin 4) is applied to the center charging contact of the battery via diode D470.

  • Page 39: Keypad

    Controller Circuits 1-11 Keypad The keypad block diagram is shown at Figure 1-2. Pressing a key creates two distinct voltages, KEYPAD_ROW and KEYPAD_COL. These voltages are routed to the microprocessor on the main board. The microprocessor samples the voltages to determine which key has been pressed. Keypad Row Keypad Row Keypad Row...
  • Page 40 1-12 THEORY OF OPERATION...
  • Page 41 Chapter 2 TROUBLESHOOTING TABLES Troubleshooting Tables for Board and IC Signals (includes Controller, DC Regulation and Audio) This section contains detailed troubleshooting tables. These tables should be used as a guide in determining the problem areas. They are not a substitute for knowledge of circuit operation and astute troubleshooting techniques.
  • Page 42 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PD4_SCK serial clock input Microprocessor PD5_SS 3.23 ASFIC chip select PD6_VLIN 3.23 EEPROM chip select PG7_R_W 3.21 PG6_AS 3.23 PG0_XA13 3.23 PB7_ADDR15 0.026 PB6_ADDR14 0.028 PB3_ADDR11 3.06 PB1_ADDR9 3.05 PB2_ADDR10 0.16 3.23...
  • Page 43 Troubleshooting Tables for Board and IC Signals (includes Controller, DC Regulation and Audio) IC Designator Pin Function DC Voltage Comments (Condition) U401 PH7_CSPROG 3.05 Microprocessor VDDL 3.23 VSSL PH6_CSGP2 3.23 PH5_CSGP1 3.23 PH4_CSIO PH3_PW4 3.21 On/off control output PH2_PW3 PH1_PW2 3.00 PH0_PW1 3.23...
  • Page 44 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 3.23 Microprocessor 3.23 Bottom option button 3.23 Top option button PA0_IC3 PA1_IC2 1.57 PA2_IC1 3.00 PA3_IC4_OC5_OC1 3.00 PA4_OC4_OC1 Squelch detect input PA5_OC3_OC1 Channel activity input PA6_OC2_OC1 PA7_PA1_OC1 VSSR VDDR 3.23 ECLK (NU) 1.60...
  • Page 45 Troubleshooting Tables for Board and IC Signals (includes Controller, DC Regulation and Audio) IC Designator Pin Function DC Voltage Comments (Condition) U404 3.06 Flash ROM 3.08 3.05 0.13 0.31 3.17 EN_WE 3.21 From U401-4 3.23 RESET 3.20 U404 3.17 Flash ROM 0.30 0.22 3.03...
  • Page 46 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U451 VDD for analog circuits 3.00 ASFIC_CMP DISC audio input 1.34 From U510 Ground for analog circuits DACU output DACR output DACG output 2.38 (typ) Power set (TX mode) VOX peak detector output 2.91 PLCAP for DC integrator 0.40...
  • Page 47 Troubleshooting Tables for Board and IC Signals (includes Controller, DC Regulation and Audio) IC Designator Pin Function DC Voltage Comments (Condition) U451 GCB5 general purpose output ASFIC_CMP RX audio send to option 1.48 Modulation output 1.50 To U201-10 RX audio out to power amp 1.51 Flat TX audio return from option 0.20...
  • Page 48 TROUBLESHOOTING TABLES...
  • Page 49 Chapter 3 CONTROLLER/KEYPAD SCHEMATICS Allocation of PCBs and Schematic Diagrams The Controller circuits are contained on the printed circuit board (PCB) containing the RF circuits. This Chapter shows the schematics for the Controller circuits only, refer to the relevant RF section for details of the related RF circuits, the PCB component layouts and the complete radio parts lists.
  • Page 50 CONTROLLER/KEYPAD SCHEMATICS...
  • Page 51 Controller Schematics Controller Schematics Controller SW_B +3 V VS_AUDIO_SEL CNTL_PWR_SET OPT_MI C PWR_SET PWR_SET OPT_TX_AUD_FLAT_RETURN CNTL_DEMO D DEMO D DEMOD OPT_TX_AUD_RETURN CNTL_BW_SEL OPT_TX_AUD_SEN D BW_SEL AUDI O BW_SEL OPT_RX_AUD_SEND_DETECTO R MOD_OUT MOD_OUT OPT_RX_AUD_SEND_UNMUTED CNTL_16_8_MHZ OPT_RX_AUD_RETURN 16_8_MHZ 16_8_MHZ VS_GAIN_SEL E500 D3_3 V BK1005HM47 SW_B + C501...
  • Page 52 Controller Schematics Microprocessor D3_3 V D3_3V C418 R410 R416 R417 D3_3V 0.1uF Q410 C410 C411 C412 C413 TP402 R412 R411 0.1uF 0.1uF 10uF 1000pF 100K SC I TP405 SH400 SH401 C419 SHIELD SHIELD 1000pF R419 HOLD 4.7K U402 X25128-2.7 EEPROM TP401 LSI O SPI_DATA_IN...
  • Page 53 Controller Schematics R516 R523 Audio C512 C514 R522 Q520 6.8pF 16pF IMX1 100K R512 150K R514 5V_A 100K U510-1 LM2904 Q520 IMX1 R511 C518 R513 DEMOD C460 R515 VR471 100K 0.1uF R470 OPT_RX_AUD_SEND_DETECTO R 5V_A U510-2 0.1uF C511 C513 2.2K LM2904 OPT_RX_AUD_RETURN 220pF...
  • Page 54 Controller Schematics DC Regulation USWB+ U310 TK71750S VR301 J301 F301 MMBZ5250B 1 VIN VOUT 4 CTRL D301 C303 C304 C312 C301 BYPASS C311 C313 DATA 390pF .01uF .018uF .01uF 33uF 10uF Q311 C310 .01uF D3_3V BATT_CHARGE VR302 C314 R310 MMBZ5250B 100K C302 1200pF...
  • Page 55 Controller Schematics Component Side Solder Side Keypad Board PCB No.8466565A01_O...
  • Page 56 Controller Schematics DISPLAY MODULE KEYPAD MAIN BOARD CONNECTOR CONNECTO R LEDBL J2-9 J1-9 LEDBL LEDBL DATA J2-16 16 J1-8 Vddd J2-1 7 J1-7 LCD_SEL J2-1 0 J1-6 J2-1 J1-5 DATA Vddd Vddd J2-2 J1-4 150pF 150pF 150pF 150pF J2-3 J1-3 LCD_SEL J2-4 J1-2...
  • Page 57 MATES WITH J491 ON NOTPLACED CAP, 150pF RADIO BOARD 4809496B11 QSMG-H799 4809496B11 QSMG-H799 NOTPLACED QSMG-H799 NOTPLACED QSMG-H799 NOTPLACED QSMG-H799 NOTPLACED QSMG-H799 Reference Motorola Part NOTPLACED QSMG-H799 Description Designator NOTPLACED QSMG-H799 4809496B11 QSMG-H799 5085880L01 Microphone, electret 4809496B11 QSMG-H799 5085738Z08 Speaker assembly with...
  • Page 58 3-10 Keypad Board Parts List 8466565A01-O...
  • Page 59 Commercial Series CP140/CP160/CP180 Portable Radios VHF (146-174MHz) Service Information Issue: December 2003...
  • Page 60 Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola...
  • Page 61 Table of Contents Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 CP140/CP160/CP180 Model Chart ..............1-1 2.0 Technical Specifications ..................1-2 Chapter 2 THEORY OF OPERATION 1.0 Introduction ......................2-1 2.0 VHF (146-174MHz) Receiver................2-1 2.1 Receiver Front-End ..................2-2 2.2 Receiver Back-End..................2-3 3.0 VHF (146-174MHz) Transmitter................2-4 3.1 Transmitter Power Amplifier ................2-4...

  • Page 63: Chapter 1 Model Chart And Technical Specifications

    CP140/CP160/CP180, VHF, 146-174 MHz Model Description MDH65KDC9AA2AN CP140, 146-174 MHz, 5 W, 16 Ch. Non-Display Model MDH65KDF9AA3AN CP160, 146-174 MHz, 5 W, 32 Ch. Limited Keypad Model MDH65KDH9AA4AN CP180, 146-174 MHz, 5 W, 64 Ch. Full Keypad Model Item Description PMUD1857_...

  • Page 64: Technical Specifications

    MODEL CHART AND TECHNICAL SPECIFICATIONS Technical Specifications Data is specified for +25°C unless otherwise stated. General Frequency: 146-174 MHz Channel Capacity: 16, 32, or 64 Channels 7.5 Volts ±20% Power Supply: Dimensions with: High Capacity Li-Ion battery 130.5mm H x 62mm W x 45mm D NiMH FM, battery 130.5mm H x 62mm W x 45mm D NiMH Std battery...
  • Page 65 Technical Specifications Transmitter Specifications RF Output High NiMH @ 7.5V: Frequency: 146-174 MHz Channel Spacing: 12.5/20/25 kHz Freq. Stability: 0.00025% (-30°C to +60°C) Spurs/Harmonics: -36 dBm < 1 GHz -30 dBm > 1 GHz Audio Response: +1, -3 dB (from 6 dB/oct. Pre-emphasis, 300 to 3000Hz) Audio Distortion:@ 1000 Hz, 60% Rated Max.
  • Page 66 MODEL CHART AND TECHNICAL SPECIFICATIONS...

  • Page 67: Chapter 2 Theory Of Operation

    Chapter 2 THEORY OF OPERATION Introduction This Chapter provides a detailed theory of operation for the VHF circuits in the radio. Schematic diagrams and board layout diagrams are included in Chapter 4 in this Section of the manual. VHF (146-174MHz) Receiver The VHF receiver covers the range of 146-174 MHz and provides switchable IF bandwidth for use with 20/25/30 kHz or 12.5 kHz channel spacing systems.

  • Page 68: Receiver Front-End

    THEORY OF OPERATION Receiver Front End Incoming RF signals from the antenna are first routed through the harmonic filter and antenna switch, part of the transmitter circuitry, before being applied to the receiver front end. The receiver front end consists of a preselector filter, RF amplifier, an interstage filter, and a double-balanced first mixer.

  • Page 69: Receiver Back-End

    VHF (146-174MHz) Receiver Receiver Back End The receiver back end is a dual conversion design. High IF selectivity is provided by FL51, a 4-pole fundamental mode 44.85 MHz crystal filter with a minimum 3 dB bandwidth of + 6.7 kHz, a maximum 20 dB bandwidth of ±12.5 kHz, and a maximum insertion loss of 3.5 dB.

  • Page 70: Vhf (146-174Mhz) Transmitter

    THEORY OF OPERATION VHF Transmitter The VHF transmitter covers the range of 146-174 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (5 watts) and low power (1 watt), or is factory preset to 2 watts. The transmitter is divided into four major blocks as shown in Figure 2-2.

  • Page 71: Harmonic Filter

    VHF Transmitter Harmonic Filter The harmonic filter consists of components C130-C136 and L130-L132. The harmonic filter is a seven-pole elliptical low-pass configuration, optimized for low insertion loss, with a 3 dB frequency of approximately 210 MHz and typically less than 0.8 dB insertion loss in the passband. Antenna Matching Network The harmonic filter presents a 50Ω...

  • Page 72: Vhf (146-174Mhz) Frequency Generation Circuitry

    THEORY OF OPERATION VHF Frequency Generation Circuitry The frequency generation system, shown in Figure 2-3, is composed of two circuit blocks, the Fractional-N synthesizer IC U201, the VCO/Buffer IC U251, and associated circuitry. Figure 2-4 shows the peripheral interconnect and support circuitry used in the synthesizer block, and Figure 2-5 details the internal circuitry of the VCOBIC and its interconnections to the surrounding components.

  • Page 73: Fractional-N Synthesizer

    VHF Frequency Generation Circuitry Fractional-N Synthesizer The Fractional-N synthesizer, shown in Figure 2-4, uses a 16.8 MHz crystal (Y201) to provide the reference frequency for the system. External components C201-C203, R202 and D201 are also part of the temperature-compensated oscillator circuit. The dc voltage applied to varactor D201 from U201 pin 25 is determined by a temperature-compensation algorithm within U201, and is specific to each crystal Y201, based on a unique code assigned to the crystal that identifies its temperature characteristics.

  • Page 74: Voltage Controlled Oscillator (Vco)

    THEORY OF OPERATION Voltage Controlled Oscillator (VCO) The VCOBIC (U251), shown in Figure 2-5, in conjunction with the Fractional-N synthesizer (U201) generates RF in both the receive and the transmit modes of operation. The TRB line (U251 pin 19) determines which oscillator and buffer are enabled. A sample of the RF signal from the enabled oscillator is routed from U251 pin 12 through a low pass filter, to the prescaler input of the synthesizer IC (U201 pin 32).

  • Page 75: Chapter 3 Troubleshooting Tables

    Chapter 3 TROUBLESHOOTING TABLES This section contains detailed troubleshooting tables. These tables should be used as a guide in determining the problem areas. They are not a substitute for knowledge of circuit operation and astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in the theory of operation sections prior to troubleshooting a radio.
  • Page 76 TROUBLESHOOTING TABLES Symptom Possible Causes Procedure Corrective Action No Audio 1. Synthesizer out of lock Verify U201-4 is at 3V dc. Troubleshoot synthesizer/VCO circuits. 2. Defective IFIC Verify audio is present at U51-8. Check Q70, Y70, U51. 3. RX audio buffer fault Verify audio is present at U451-2.

  • Page 77: Troubleshooting Table For Synthesizer

    Troubleshooting Table for Synthesizer Troubleshooting Table for Synthesizer Symptom Possible Causes Procedure Corrective Action Synthesizer Out of 1. VCO fault Verify oscillator is working, check RF Check VCO tank components Lock (RX mode level at U251-10 per schematic. connected to U251-5 and 6. only) Check dc voltages at U251 pin 2 Check for shorts/opens, replace...

  • Page 78: Troubleshooting Table For Transmitter

    TROUBLESHOOTING TABLES Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action No Transmit (no 1. PTT switch defective. Verify U401-71 goes low when PTT Replace PTT switch S441. TX LED indication) is pressed. 2. EXT MIC PTT fault Verify U401-72 goes low when J471- Check/replace Q470, L471 etc.
  • Page 79 Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action Poor TX range, 1. RF test jack defective Verify continuity of J140 pins 3 and 4 Replace J140. conducted power in RX mode only. 2. Antenna matching net- Visually inspect components C140- Repair/replace if necessary.

  • Page 80: Troubleshooting Table For Board And Ic Signals

    TROUBLESHOOTING TABLES Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) RF input 44.85 MHz 1.20 IFIC RF input decoupling 1.20 2nd LO osc output 4.02 2nd LO osc input 4.60 RSSI output 0.74 (no received signal) 4.70 Audio feedback...
  • Page 81 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U110 RF input (TX mode) RF Power Amp Vgg (gate bias) 4.25V (typ) (TX mode) 6.59 (TX mode) RF output Do not measure Ground U150 Unit 1 output 5.8V (typ) (TX mode)
  • Page 82 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U201 Ref osc XTAL2 Freq Synthesizer Ref osc warp output 3.00 Superfilter cap 4.48 Superfilter base (NU) 3.76 Superfilter output 4.52 Superfilter input 4.96 Prescaler input 1.97 Prescaler ground Prescaler Vdd 2.99 Prescaler Vref (NU) 1.97...
  • Page 83 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U251 Prescaler output 2.26 VCO / Buffer TX switch output (NU) 0.06 Vcc_BUFFERS 3.00 TX VCO emitter (RX mode) TX VCO base (RX mode) GND_LOGIC Vcc_LOGIC 3.00 TRB input...
  • Page 84 3-10 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PB1_ADDR9 3.05 Microprocessor PB2_ADDR10 0.16 3.23 PBO_ADDR8 3.05 PB5_ADDR13 0.13 PG1_XA14 0.20 PG4_XA17 3.17 PG5_XA18 PG3_XA16 3.21 PG2_XA15 0.30 PB4_ADDR12 0.22 PF7_ADDR7 3.03 PF6_ADDR6 3.08 PF5_ADDR5 3.06 PF4_ADDR4 0.16 PF3_ADDR3 0.26...
  • Page 85 Troubleshooting Table for Board and IC Signals 3-11 IC Designator Pin Function DC Voltage Comments (Condition) U401 PH1_PW2 3.00 Microprocessor PH0_PW1 3.23 Synth chip select XIRQ 3.00 1.48 RX enable 0.01 TX enable 3.23 Green LED enable Red LED enable 2.98 Lock detect from U201-4 MODB_VSTBY...
  • Page 86 3-12 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PA3_IC4_OC5_OC1 3.00 Microprocessor PA4_OC4_OC1 Squelch detect input PA5_OC3_OC1 Channel activity input PA6_OC2_OC1 PA7_PA1_OC1 VSSR VDDR 3.23 ECLK (NU) 1.60 EXTAL 1.70 Clock from U451-28 XTAL 1.40 Not used VDDSYN XFC (NU) RESET...
  • Page 87 Troubleshooting Table for Board and IC Signals 3-13 IC Designator Pin Function DC Voltage Comments (Condition) U404 3.17 Flash ROM 0.30 0.22 3.03 3.08 3.06 0.24 3.08 3.05 3.05 0.69 0.94 1.08 0.78 0.59 0.66 0.67 0.75 EN_CE 3.01 From U401-38 0.16 EN_OE From U401-86...
  • Page 88 3-14 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U451 GCB1 general purpose output ASFIC_CMP GCB0 general purpose output 3.00 BW select (25 kHz mode) Squelch channel activity output To U401-84 Squelch detect digital output To U401-83 PL/low speed data I/O 1.50 High speed data I/O 3.00...
  • Page 89 Troubleshooting Table for Board and IC Signals 3-15 IC Designator Pin Function DC Voltage Comments (Condition) U480 Unit 1 output 2.48 Dual Opamp Unit 1 (-) input 2.48 Unit 1 (+) input 2.46 Ground Unit 2 (+) input 0.28 Unit 2 (-) input 0.29 Unit 2 output 4.96...
  • Page 90 3-16 TROUBLESHOOTING TABLES...

  • Page 91: Allocation Of Schematics And Circuit Boards

    Chapter 4 VHF PCB/SCHEMATICS/PARTS LISTS Allocation of Schematics and Circuit Boards VHF (146-174MHz) The VHF circuits are contained on the printed circuit board (PCB) which also contains the Controller circuits. This Chapter shows the schematics for the VHF circuits, the Controller circuits are contained in Section 2 of this manual.
  • Page 92 VHF PCB/SCHEMATICS/PARTS LISTS...

  • Page 93: Vhf Pcb 8486342Z13-C Schematic Diagrams

    VHF PCB 8486342Z13-C Schematic Diagrams VHF PCB 8486342Z13-C Schematic Diagrams D301 C465 R480 C488 C458 C454 C513 S444 C480 J471 R470 R473 U451 FL54 R496 C470 L265 L255 C267 D262 C257 R481 R472 C473 C489 C482 C302 R522 R471 C455 F301 U480 C263...
  • Page 94 VHF PCB 8486342Z13-C Schematic Diagrams C206 R206 C52 C53 C140 L120 C417 R416 C220 R411 U151 L130 L132 C222 R121 R434 R502 R433 L140 R432 C131 C135 C221 FL51 R150 R501 C223 C224 R120 C157 R151 SH200 D121 R154 C152 R227 C123 C228...
  • Page 95 VHF PCB 8486342Z13-C Schematic Diagrams VHF R2 USWB+ USWB+ USWB+ USWB+ TX_ENA TX_ENA PWR_SET TX_VHF_R2 PWR_SET RX_FE_VHF_R2 DEMOD DEMOD RX_BE BW_SEL BW_SEL IF_IN IF_OUT RX_IN RX_OUT RSSI RSSI TX_INJ CONTROLLER RX_INJ MOD_OUT MOD_IN PRESC PRESC 16_8_MHZ 16_8_MHZ RX_INJ SYNTH_VHF_R2 V_STEER V_STEER SYNTH_CS SYNTH_CS...
  • Page 96 VHF PCB 8486342Z13-C Schematic Diagrams VHF R2 Front End FE_5R 6.8K 1000pF FE_IF_OUT SH40 IF_OUT SHIELD SHIELD UMT1 680nH 150nH 82pF 100nH 1000pF 1000pF 6.8K 0.1uF 30pF 68nH 68nH 68nH 20pF 24pF 1000pF 27pF 36pF 15pF 3.0pF 15pF 30pF FE_RF_IN 68nH 68nH 0.74V...
  • Page 97 VHF PCB 8486342Z13-C Schematic Diagrams RX Back End (Overtone) U52-1 FL53 TC7W04F CFWC455E 0.1uF OUT 2 U52-2 100K TC7W04F IF_BAND_SEL 5V for 25kHz BW_SE L 0V for 12.5kHz 0.1uF FL54 CFWC455G 1 IN 47pF U52-3 3.3K SH50 SH52 TC7W04F SHIELD SHIELD U52-4 2.4K...
  • Page 98 VHF PCB 8486342Z13-C Schematic Diagrams VHF R2 Synthesizer FN_V_SF 4.5V V_SF C231 C232 C233 SH200 SH201 R247 R230 0.1uF 1000pF 4.7uF SHIELD SHIELD 270K 200K FN_LOCK LOCK C204 LOCK: 3V UNLOCK: 0V WARP 25 470pF INDMULT 16 SFOUT 28 ADAPTSW 46 FN_V_STEER CCOMP LOCK...
  • Page 99 VHF PCB 8486342Z13-C Schematic Diagrams VHF R2 VCO V_SF VCO_VSF R273 L270 4.5V V_S F 560nH C270 C274 C285 C292 VCO_3V 1200pF 0.1uF 0.1uF 1200pF SH251 SH253 R270 SH250 SHIELD SHIELD SHIELD C272 0.1uF R284 L282 L292 68nH 47nH C273 R271 R272 8.2K...
  • Page 100 4-10 VHF PCB 8486342Z13-C Schematic Diagrams VHF R2 Tx PA_USWB+ USWB+ C170 PA_TX_EN A R171 Q171 TX_ENA 0.1uF MMBT3904 Q170 6.8K EMB10 R524 SH100 SHIELD C172 1500pF C120 R120 C157 C154 1500pF R152 0.1uF 1500pF C155 R158 C151 100K R121 R153 U151 1.5K...

  • Page 101: Vhf Pcb 8486342Z13-C Parts List

    VHF PCB 8486342Z13-C Parts List 4-11 VHF PCB 8486342Z13-C Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Part No. Part No. Part No. 2113743M24 CAP, 0.1uF C122 2113740F31 CAP, 15pF C216 2113743E20 CAP, 0.1uF Circuit Motorola Description Part No.
  • Page 102 4-12 VHF PCB 8486342Z13-C Parts List Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C276 2113743N19 CAP, 5.1pF C410 2311049A57 CAPP, 10uF C467 2113743L19 CAP, 1200pF CR41 4802246J04...
  • Page 103 VHF PCB 8486342Z13-C Parts List 4-13 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. 2413923C09 IDCTR, 68nH 4802197J95 PBR941 0662057N06 RES, 20K R212 0662057C01 RES, 0 2413923C09 IDCTR, 68nH...
  • Page 104 SH52 2686424Z01 SHIELD Y202 Not_Placed 45J68 R421 0662057V27 RES, 100K R489 0662057A96 RES, 91K SH100 2686418Z01 SHIELD * Motorola Depot Servicing only R422 0662057N23 RES, 100K R490 Not_Placed RES, 2.2K SH200 2686424Z01 SHIELD R423 0662057N23 RES, 100K R491 0662057M01 RES, 0...
  • Page 105 Commercial Series CP140/CP160/CP180 Portable Radios UHF1 (403-440MHz) Service Information Issue: December 2003...
  • Page 106 Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola...
  • Page 107 Table of Contents Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 CP140/CP160/CP180 Model Chart ..............1-1 2.0 Technical Specifications ..................1-2 Chapter 2 THEORY OF OPERATION 1.0 Introduction ......................2-1 2.0 UHF1 (403-440MHz) Receiver ................2-1 2.1 Receiver Front-End ..................2-2 2.2 Receiver Back-End..................2-3 3.0 UHF1 (403-440MHz) Transmitter.................2-4 3.1 Transmitter Power Amplifier ................2-4...

  • Page 109: Chapter 1 Model Chart And Technical Specifications

    CP140/CP160/CP180 Series, UHF1, 403-440 MHz Model Description MDH65QDC9AA2AN CP140, 403-440 MHz, 4 W, 16 Ch. Non-Display Model MDH65QDF9AA3AN CP160, 403-440 MHz, 4 W, 32 Ch. Limited Keypad Model MDH65QDH9AA4AN CP180, 403-440 MHz, 4 W, 64 Ch. Full Keypad Model Item Description PMUE1972_...

  • Page 110: Technical Specifications

    MODEL CHART AND TECHNICAL SPECIFICATIONS Technical Specifications Data is specified for +25°C unless otherwise stated. General UHF1 Frequency: 403-440 MHz Channel Capacity: 16, 32, or 64 Channels 7.5 Volts ±20% Power Supply: Dimensions with: High Capacity Li-Ion battery 130.5mm H x 62mm W x 45mm D NiMH FM, battery 130.5mm H x 62mm W x 45mm D NiMH Std battery...
  • Page 111 Technical Specifications Transmitter Specifications UHF1 RF Output High NiMH @ 7.5V: Frequency: 403-440 MHz Channel Spacing: 12.5/20/25 kHz Freq. Stability: 0.00025% (-30°C to +60°C) Spurs/Harmonics: -36 dBm < 1 GHz -30 dBm > 1 GHz Audio Response: +1, -3 dB (from 6 dB/oct.
  • Page 112 MODEL CHART AND TECHNICAL SPECIFICATIONS...

  • Page 113: Chapter 2 Theory Of Operation

    Chapter 2 THEORY OF OPERATION Introduction This Chapter provides a detailed theory of operation for the UHF1 circuits in the radio. Schematic diagrams and board layout diagrams are included in Chapter 4 in this Section of the manual. UHF (403-440MHz) Receiver The UHF receiver covers the range of 403-440 MHz and provides switchable IF bandwidth for use with 20/25/30 kHz or 12.5 kHz channel spacing systems.

  • Page 114: Receiver Front-End

    THEORY OF OPERATION Receiver Front End Incoming RF signals from the antenna are first routed through the harmonic filter and antenna switch, part of the transmitter circuitry, before being applied to the receiver front end. The receiver front end consists of a preselector filter, RF amplifier, an interstage filter, and a double-balanced first mixer.

  • Page 115: Receiver Back-End

    UHF (403-440MHz) Receiver Receiver Back End The receiver back end is a dual conversion design. High IF selectivity is provided by FL51, a 4-pole fundamental mode 44.85 MHz crystal filter with a minimum 3 dB bandwidth of ±6.7 kHz, a maximum 20 dB bandwidth of + 12.5 kHz, and a maximum insertion loss of 3.5 dB.

  • Page 116: Transmitter Power Amplifier

    THEORY OF OPERATION UHF Transmitter The UHF transmitter covers the range of 403-440 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (4 watts) and low power (1 watt), or is factory preset to 2 watts. The transmitter is divided into four major blocks as shown in Figure 2-2.

  • Page 117: Harmonic Filter

    UHF Transmitter Harmonic Filter The harmonic filter consists of components C122, C136 and L130-L132. The harmonic filter is a seven-pole Chebychev low-pass configuration, optimized for low insertion loss, with a 3 dB frequency of approximately 600 MHz and typically less than 0.8 dB insertion loss in the passband. Antenna Matching Network The harmonic filter presents a 50Ω...
  • Page 118 THEORY OF OPERATION UHF Frequency Generation Circuitry The frequency generation system, shown in Figure 2-3, is composed of two circuit blocks, the Fractional-N synthesizer IC U201, the VCO/Buffer IC U251, and associated circuitry. Figure 2-4 shows the peripheral interconnect and support circuitry used in the synthesizer block, and Figure 2-5 details the internal circuitry of the VCOBIC and its interconnections to the surrounding components.

  • Page 119: Fractional-N Synthesizer

    UHF Frequency Generation Circuitry Fractional-N Synthesizer The Fractional-N synthesizer, shown in Figure 2-4, uses a 16.8 MHz crystal (Y201) to provide the reference frequency for the system. External components C201-C203, R202 and D201 are also part of the temperature-compensated oscillator circuit. The dc voltage applied to varactor D201 from U201 pin 25 is determined by a temperature-compensation algorithm within U201, and is specific to each crystal Y201, based on a unique code assigned to the crystal that identifies its temperature characteristics.

  • Page 120: Voltage Controlled Oscillator (Vco)

    THEORY OF OPERATION Voltage Controlled Oscillator (VCO) The VCOBIC (U251), shown in Figure 2-5, in conjunction with the Fractional-N synthesizer (U201) generates RF in both the receive and the transmit modes of operation. The TRB line (U251 pin 19) determines which oscillator and buffer are enabled. A sample of the RF signal from the enabled oscillator is routed from U251 pin 12 through a low pass filter, to the prescaler input of the synthesizer IC (U201 pin 32).

  • Page 121: Chapter 3 Troubleshooting Tables

    Chapter 3 TROUBLESHOOTING TABLES This section contains detailed troubleshooting tables. These tables should be used as a guide in determining the problem areas. They are not a substitute for knowledge of circuit operation and astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in the theory of operation sections prior to troubleshooting a radio.
  • Page 122 TROUBLESHOOTING TABLES Symptom Possible Causes Procedure Corrective Action No Audio 1. Synthesizer out of lock Verify U201-4 is at 3V dc. Troubleshoot synthesizer/VCO circuits. 2. Defective IFIC Verify audio is present at U51-8. Check Q70, Y70, U51. 3. RX audio buffer fault Verify audio is present at U451-2.

  • Page 123: Troubleshooting Table For Synthesizer

    Troubleshooting Table for Synthesizer Troubleshooting Table for Synthesizer Symptom Possible Causes Procedure Corrective Action Synthesizer Out of 1. VCO fault Verify oscillator is working, check RF Check VCO tank components Lock (RX mode level at U251-10 per schematic. connected to U251-5 and 6. only) Check dc voltages at U251 pin 2 Check for shorts/opens, replace...

  • Page 124: Troubleshooting Table For Transmitter

    TROUBLESHOOTING TABLES Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action No Transmit (no 1. PTT switch defective. Verify U401-71 goes low when PTT Replace PTT switch S441. TX LED indication) is pressed. 2. EXT MIC PTT fault Verify U401-72 goes low when J471- Check/replace Q470, L471 etc.
  • Page 125 Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action Poor TX range, 1. RF test jack defective Verify continuity of J140 pins 3 and 4 Replace J140. conducted power in RX mode only. 2. Antenna matching net- Visually inspect components C140- Repair/replace if necessary.

  • Page 126: Troubleshooting Table For Board And Ic Signals

    TROUBLESHOOTING TABLES Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) RF input 44.85 MHz 1.20 IFIC RF input decoupling 1.20 2nd LO osc output 4.02 2nd LO osc input 4.60 RSSI output 0.74 (no received signal) 4.70 Audio feedback...
  • Page 127 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U110 RF input (TX mode) RF Power Amp Vgg (gate bias) 2.65 (typ) (TX mode) 6.59 (TX mode) RF output Do not measure Ground U150 Unit 1 output 4.20 (typ) (TX mode)
  • Page 128 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U201 Ref osc XTAL2 Freq Synthesizer Ref osc warp output 3.00 Superfilter cap 4.48 Superfilter base (NU) 3.76 Superfilter output 4.52 Superfilter input 4.96 Prescaler input 1.97 Prescaler ground Prescaler Vdd 2.99 Prescaler Vref (NU) 1.97...
  • Page 129 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U251 Prescaler output 2.26 VCO / Buffer TX switch output (NU) 0.06 Vcc_BUFFERS 3.00 TX VCO emitter (RX mode) TX VCO base (RX mode) GND_LOGIC Vcc_LOGIC 3.00 TRB input...
  • Page 130 3-10 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PB1_ADDR9 3.05 Microprocessor PB2_ADDR10 0.16 3.23 PBO_ADDR8 3.05 PB5_ADDR13 0.13 PG1_XA14 0.20 PG4_XA17 3.17 PG5_XA18 PG3_XA16 3.21 PG2_XA15 0.30 PB4_ADDR12 0.22 PF7_ADDR7 3.03 PF6_ADDR6 3.08 PF5_ADDR5 3.06 PF4_ADDR4 0.16 PF3_ADDR3 0.26...
  • Page 131 Troubleshooting Table for Board and IC Signals 3-11 IC Designator Pin Function DC Voltage Comments (Condition) U401 PH1_PW2 3.00 Microprocessor PH0_PW1 3.23 Synth chip select XIRQ 3.00 1.48 RX enable 0.01 TX enable 3.23 Green LED enable Red LED enable 2.98 Lock detect from U201-4 MODB_VSTBY...
  • Page 132 3-12 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PA3_IC4_OC5_OC1 3.00 Microprocessor PA4_OC4_OC1 Squelch detect input PA5_OC3_OC1 Channel activity input PA6_OC2_OC1 PA7_PA1_OC1 VSSR VDDR 3.23 ECLK (NU) 1.60 EXTAL 1.70 Clock from U451-28 XTAL 1.40 Not used VDDSYN XFC (NU) RESET...
  • Page 133 Troubleshooting Table for Board and IC Signals 3-13 IC Designator Pin Function DC Voltage Comments (Condition) U404 3.17 Flash ROM 0.30 0.22 3.03 3.08 3.06 0.24 3.08 3.05 3.05 0.69 0.94 1.08 0.78 0.59 0.66 0.67 0.75 EN_CE 3.01 From U401-38 0.16 EN_OE From U401-86...
  • Page 134 3-14 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U451 GCB1 general purpose output ASFIC_CMP GCB0 general purpose output 3.00 BW select (25 kHz mode) Squelch channel activity output To U401-84 Squelch detect digital output To U401-83 PL/low speed data I/O 1.50 High speed data I/O 3.00...
  • Page 135 Troubleshooting Table for Board and IC Signals 3-15 IC Designator Pin Function DC Voltage Comments (Condition) U480 Unit 1 output 2.48 Dual Opamp Unit 1 (-) input 2.48 Unit 1 (+) input 2.46 Ground Unit 2 (+) input 0.28 Unit 2 (-) input 0.29 Unit 2 output 4.96...
  • Page 136 3-16 TROUBLESHOOTING TABLES...

  • Page 137: Allocation Of Schematics And Circuit Boards

    Chapter 4 UHF1 PCB/SCHEMATICS/PARTS LISTS Allocation of Schematics and Circuit Boards UHF1 (403-440MHz) The UHF1 circuits are contained on the printed circuit board (PCB) which also contains the Controller circuits. This Chapter shows the schematics for the UHF circuits, the Controller circuits are contained in Section 2 of this manual.
  • Page 138 UHF1 PCB/SCHEMATICS/PARTS LISTS...

  • Page 139: Uhf1 Pcb 8486635Z03-O Schematic Diagrams

    UHF1 PCB 8486635Z03-O Schematic Diagrams UHF1 PCB 8486635Z03-O Schematic Diagrams D301 C488 C465 R480 C458 C454 S444 C513 C480 J471 R470 R473 R264 U451 R254 FL54 R496 L265 L255 C470 R253 C267 C473 R472 C256 R481 C257 C302 C489 C482 R522 C455 L264...
  • Page 140 UHF1 PCB 8486635Z03-O Schematic Diagrams C206 R206 C52 C53 C220 C417 R416 R411 D121 U151 C222 R434 L140 R502 R433 R432 C221 FL51 C122 R150 R501 C223 C157 L132 L141 C224 C132 R151 C159 SH200 R154 C158 L130 C152 R227 C227 C228 C115...
  • Page 141 UHF1 PCB 8486635Z03-O Schematic Diagrams UHF R1 USWB + USWB+ USWB+ USWB TX_EN A TX_ENA PWR_SET TX_UHF_R1 PWR_SET RX_BE RX_FE_UHF_R1 DEMOD DEMOD CONTROLLER BW_SEL BW_SEL IF_IN IF_OUT RX_IN RX_OUT RSSI RSSI TX_INJ RX_INJ MOD_OUT MOD_IN PRESC PRESC 16_8_MHZ 16_8_MHZ VCO_UHF_R1 RX_INJ SYNTH_UHF_R1 V_STEER...
  • Page 142 UHF1 PCB 8486635Z03-O Schematic Diagrams FE_5R 5.6K 390pF UMT1 UHF R1 Front End SH40 SHIELD SHIELD 390pF 390pF 18nH 0.1uF 5.6K C523 0.55pF C521 4.2V 5.5% FE_IF_OUT 1.2K 390pF 3.3pF C522 IF_OUT 3.0% 680nH 18pF 1.8pF 1.8pF 20pF 390pF 2.2pF 0.79V RX_IN 4.5%...
  • Page 143 UHF1 PCB 8486635Z03-O Schematic Diagrams RX Back End (Overtone) U52-1 FL53 TC7W04F CFWC455E 0.1uF OUT 2 U52-2 100K TC7W04F IF_BAND_SEL 5V for 25kHz BW_SE L 0V for 12.5kHz 0.1uF FL54 CFWC455G 1 IN 47pF U52-3 3.3K SH50 SH52 TC7W04F SHIELD SHIELD U52-4 2.4K...
  • Page 144 UHF1 PCB 8486635Z03-O Schematic Diagrams UHF R1 Synthesizer FN_V_SF 4.5V V_SF SH200 SH201 C231 C232 C233 SHIELD SHIELD R247 R230 LOCK: 3V 1000pF 0.1uF 4.7uF UNLOCK: 0V FN_LOCK LOCK C204 31 NC3 WARP 470pF 29 NC2 INDMULT 17 NC1 SFOUT ADAPTSW 42 CCOMP LOCK...
  • Page 145 UHF1 PCB 8486635Z03-O Schematic Diagrams UHF R1 VCO V_SF VCO_VSF L270 R273 R277 4.5V V_SF 220nH C270 C274 C292 C285 VCO_3V 390pF 0.1uF 390pF 0.1uF L272 220nH SH250 SH251 SH253 C272 SHIELD SHIELD SHIELD L292 0.1uF L282 R284 15nH 15nH C273 R272 R271...
  • Page 146 4-10 UHF1 PCB 8486635Z03-O Schematic Diagrams UHF R1 Tx PA_USWB+ USWB+ Q171 PA_TX_ENA TX_ENA C170 390pF Q170 EMB10 C525 390pF C172 R120 C157 C154 390pF 390pF 0.1uF R152 R121 100K R158 R159 R153 C151 U151 100K 390pF 5.1K U150-2 C150 C156 LM2904 57R01...

  • Page 147: Uhf1 Pcb 8486635Z03-O Parts List

    UHF1 PCB 8486635Z03-O Parts List 4-11 UHF1 PCB 8486635Z03-O Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Parts List Part No. Part No. Part No. Circuit Motorola Not_Placed CAP, 10pF C107 2113743N13 CAP, 3pF C210 2113743L09 CAP, 470pF Description Part No.
  • Page 148 4-12 UHF1 PCB 8486635Z03-O Parts List Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C270 2113743L07 CAP, 390pF C405 2113743N50 CAP, 150pF C462 2113743E20 CAP, 0.1uF C513 2113740F59...
  • Page 149 UHF1 PCB 8486635Z03-O Parts List 4-13 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. J470 0985818A01 CONN_J L272 2413926N28 IDCTR, 220nH 0662057M43 RES, 51 R153 0662057V27 RES, 100K...
  • Page 150 SH52 2686424Z01 SHIELD Y202 Not_Placed 45J68 R423 0662057N23 RES, 100K R491 0662057M01 RES, 0 SH100 2686418Z01 SHIELD * Motorola Depot Servicing only R424 0662057V35 RES, 200K R492 0662057N08 RES, 24K SH200 2686424Z01 SHIELD R425 0662057V27 RES, 100K R493 0662057N35 RES, 330K...
  • Page 151 Commercial Series CP140/CP160/CP180 Portable Radios UHF2 (438-470MHz) Service Information Issue: December 2003...
  • Page 152 Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola...
  • Page 153 Table of Contents Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 CP140/CP160/CP180 Model Chart ..............1-1 2.0 Technical Specifications ..................1-2 Chapter 2 THEORY OF OPERATION 1.0 Introduction ......................2-1 2.0 UHF2 (438-470MHz) Receiver ................2-1 2.1 Receiver Front-End ..................2-2 2.2 Receiver Back-End..................2-3 3.0 UHF2 (438-470MHz) Transmitter.................2-4 3.1 Transmitter Power Amplifier ................2-4...

  • Page 155: Chapter 1 Model Chart And Technical Specifications

    CP140/CP160/CP180 Series, UHF2, 438-470 MHz Model Description MDH65RDC9AA2AN CP140, 438-470 MHz, 4 W, 16 Ch. Non-Display Model MDH65RDF9AA3AN CP160, 438-470 MHz, 4 W, 32 Ch. Limited Keypad Model MDH65RDH9AA4AN CP180, 438-470 MHz, 4 W, 64 Ch. Full Keypad Model Item Description PMUE1966_...

  • Page 156: Technical Specifications

    MODEL CHART AND TECHNICAL SPECIFICATIONS Technical Specifications Data is specified for +25°C unless otherwise stated. General UHF2 Frequency: 438-470 MHz Channel Capacity: 16, 32, or 64 Channels 7.5 Volts ±20% Power Supply: Dimensions with: High Capacity Li-Ion battery 130.5mm H x 62mm W x 45mm D NiMH FM, battery 130.5mm H x 62mm W x 45mm D NiMH Std battery...
  • Page 157 Technical Specifications Transmitter Specifications UHF2 RF Output High NiMH @ 7.5V: Frequency: 438-470 MHz Channel Spacing: 12.5/20/25 kHz Freq. Stability: 0.00025% (-30°C to +60°C) Spurs/Harmonics: -36 dBm < 1 GHz -30 dBm > 1 GHz Audio Response: +1, -3 dB (from 6 dB/oct.
  • Page 158 MODEL CHART AND TECHNICAL SPECIFICATIONS...

  • Page 159: Chapter 2 Theory Of Operation

    Chapter 2 THEORY OF OPERATION Introduction This Chapter provides a detailed theory of operation for the UHF circuits in the radio. Schematic diagrams and board layout diagrams are included in Chapter 4 in this Section of the manual. UHF (438-470MHz) Receiver The UHF receiver covers the range of 438-470 MHz and provides switchable IF bandwidth for use with 20/25/30 kHz or 12.5 kHz channel spacing systems.

  • Page 160: Receiver Front-End

    THEORY OF OPERATION Receiver Front End Incoming RF signals from the antenna are first routed through the harmonic filter and antenna switch, part of the transmitter circuitry, before being applied to the receiver front end. The receiver front end consists of a preselector filter, RF amplifier, an interstage filter, and a double-balanced first mixer.

  • Page 161: Receiver Back-End

    UHF (438-470MHz) Receiver Receiver Back End The receiver back end is a dual conversion design. High IF selectivity is provided by FL51, a 4-pole fundamental mode 44.85 MHz crystal filter with a minimum 3 dB bandwidth of ±6.7 kHz, a maximum 20 dB bandwidth of + 12.5 kHz, and a maximum insertion loss of 3.5 dB.

  • Page 162: Transmitter Power Amplifier

    THEORY OF OPERATION UHF Transmitter The UHF transmitter covers the range of 438-470 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (4 watts) and low power (1 watt), or is factory preset to 2 watts. The transmitter is divided into four major blocks as shown in Figure 2-2.

  • Page 163: Harmonic Filter

    UHF Transmitter Harmonic Filter The harmonic filter consists of components C130-C136 and L130-L132. The harmonic filter is a seven-pole Chebychev low-pass configuration, optimized for low insertion loss, with a 3 dB frequency of approximately 600 MHz and typically less than 0.8 dB insertion loss in the passband. Antenna Matching Network The harmonic filter presents a 50Ω...
  • Page 164 THEORY OF OPERATION UHF Frequency Generation Circuitry The frequency generation system, shown in Figure 2-3, is composed of two circuit blocks, the Fractional-N synthesizer IC U201, the VCO/Buffer IC U251, and associated circuitry. Figure 2-4 shows the peripheral interconnect and support circuitry used in the synthesizer block, and Figure 2-5 details the internal circuitry of the VCOBIC and its interconnections to the surrounding components.

  • Page 165: Fractional-N Synthesizer

    UHF Frequency Generation Circuitry Fractional-N Synthesizer The Fractional-N synthesizer, shown in Figure 2-4, uses a 16.8 MHz crystal (Y201) to provide the reference frequency for the system. External components C201-C203, R202 and D201 are also part of the temperature-compensated oscillator circuit. The dc voltage applied to varactor D201 from U201 pin 25 is determined by a temperature-compensation algorithm within U201, and is specific to each crystal Y201, based on a unique code assigned to the crystal that identifies its temperature characteristics.

  • Page 166: Voltage Controlled Oscillator (Vco)

    THEORY OF OPERATION Voltage Controlled Oscillator (VCO) The VCOBIC (U251), shown in Figure 2-5, in conjunction with the Fractional-N synthesizer (U201) generates RF in both the receive and the transmit modes of operation. The TRB line (U251 pin 19) determines which oscillator and buffer are enabled. A sample of the RF signal from the enabled oscillator is routed from U251 pin 12 through a low pass filter, to the prescaler input of the synthesizer IC (U201 pin 32).

  • Page 167: Chapter 3 Troubleshooting Tables

    Chapter 3 TROUBLESHOOTING TABLES This section contains detailed troubleshooting tables. These tables should be used as a guide in determining the problem areas. They are not a substitute for knowledge of circuit operation and astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in the theory of operation sections prior to troubleshooting a radio.
  • Page 168 TROUBLESHOOTING TABLES Symptom Possible Causes Procedure Corrective Action No Audio 1. Synthesizer out of lock Verify U201-4 is at 3V dc. Troubleshoot synthesizer/VCO circuits. 2. Defective IFIC Verify audio is present at U51-8. Check Q70, Y70, U51. 3. RX audio buffer fault Verify audio is present at U451-2.

  • Page 169: Troubleshooting Table For Synthesizer

    Troubleshooting Table for Synthesizer Troubleshooting Table for Synthesizer Symptom Possible Causes Procedure Corrective Action Synthesizer Out of 1. VCO fault Verify oscillator is working, check RF Check VCO tank components Lock (RX mode level at U251-10 per schematic. connected to U251-5 and 6. only) Check dc voltages at U251 pin 2 Check for shorts/opens, replace...

  • Page 170: Troubleshooting Table For Transmitter

    TROUBLESHOOTING TABLES Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action No Transmit (no 1. PTT switch defective. Verify U401-71 goes low when PTT Replace PTT switch S441. TX LED indication) is pressed. 2. EXT MIC PTT fault Verify U401-72 goes low when J471- Check/replace Q470, L471 etc.
  • Page 171 Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action Poor TX range, 1. RF test jack defective Verify continuity of J140 pins 3 and 4 Replace J140. conducted power in RX mode only. 2. Antenna matching net- Visually inspect components C140- Repair/replace if necessary.

  • Page 172: Troubleshooting Table For Board And Ic Signals

    TROUBLESHOOTING TABLES Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) RF input 44.85 MHz 1.20 IFIC RF input decoupling 1.20 2nd LO osc output 4.02 2nd LO osc input 4.60 RSSI output 0.74 (no received signal) 4.70 Audio feedback...
  • Page 173 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U110 RF input (TX mode) RF Power Amp Vgg (gate bias) 2.65 (typ) (TX mode) 6.59 (TX mode) RF output Do not measure Ground U150 Unit 1 output 4.20 (typ) (TX mode)
  • Page 174 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U201 Ref osc XTAL2 Freq Synthesizer Ref osc warp output 3.00 Superfilter cap 4.48 Superfilter base (NU) 3.76 Superfilter output 4.52 Superfilter input 4.96 Prescaler input 1.97 Prescaler ground Prescaler Vdd 2.99 Prescaler Vref (NU) 1.97...
  • Page 175 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U251 Prescaler output 2.26 VCO / Buffer TX switch output (NU) 0.06 Vcc_BUFFERS 3.00 TX VCO emitter (RX mode) TX VCO base (RX mode) GND_LOGIC Vcc_LOGIC 3.00 TRB input...
  • Page 176 3-10 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PB1_ADDR9 3.05 Microprocessor PB2_ADDR10 0.16 3.23 PBO_ADDR8 3.05 PB5_ADDR13 0.13 PG1_XA14 0.20 PG4_XA17 3.17 PG5_XA18 PG3_XA16 3.21 PG2_XA15 0.30 PB4_ADDR12 0.22 PF7_ADDR7 3.03 PF6_ADDR6 3.08 PF5_ADDR5 3.06 PF4_ADDR4 0.16 PF3_ADDR3 0.26...
  • Page 177 Troubleshooting Table for Board and IC Signals 3-11 IC Designator Pin Function DC Voltage Comments (Condition) U401 PH1_PW2 3.00 Microprocessor PH0_PW1 3.23 Synth chip select XIRQ 3.00 1.48 RX enable 0.01 TX enable 3.23 Green LED enable Red LED enable 2.98 Lock detect from U201-4 MODB_VSTBY...
  • Page 178 3-12 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PA3_IC4_OC5_OC1 3.00 Microprocessor PA4_OC4_OC1 Squelch detect input PA5_OC3_OC1 Channel activity input PA6_OC2_OC1 PA7_PA1_OC1 VSSR VDDR 3.23 ECLK (NU) 1.60 EXTAL 1.70 Clock from U451-28 XTAL 1.40 Not used VDDSYN XFC (NU) RESET...
  • Page 179 Troubleshooting Table for Board and IC Signals 3-13 IC Designator Pin Function DC Voltage Comments (Condition) U404 3.17 Flash ROM 0.30 0.22 3.03 3.08 3.06 0.24 3.08 3.05 3.05 0.69 0.94 1.08 0.78 0.59 0.66 0.67 0.75 EN_CE 3.01 From U401-38 0.16 EN_OE From U401-86...
  • Page 180 3-14 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U451 GCB1 general purpose output ASFIC_CMP GCB0 general purpose output 3.00 BW select (25 kHz mode) Squelch channel activity output To U401-84 Squelch detect digital output To U401-83 PL/low speed data I/O 1.50 High speed data I/O 3.00...
  • Page 181 Troubleshooting Table for Board and IC Signals 3-15 IC Designator Pin Function DC Voltage Comments (Condition) U480 Unit 1 output 2.48 Dual Opamp Unit 1 (-) input 2.48 Unit 1 (+) input 2.46 Ground Unit 2 (+) input 0.28 Unit 2 (-) input 0.29 Unit 2 output 4.96...
  • Page 182 3-16 TROUBLESHOOTING TABLES...

  • Page 183: Allocation Of Schematics And Circuit Boards

    Chapter 4 UHF2 PCB/SCHEMATICS/PARTS LISTS Allocation of Schematics and Circuit Boards UHF2 (438-470MHz) The UHF circuits are contained on the printed circuit board (PCB) which also contains the Controller circuits. This Chapter shows the schematics for the UHF circuits, the Controller circuits are contained in Section 2 of this manual.
  • Page 184 UHF2 PCB/SCHEMATICS/PARTS LISTS...

  • Page 185: Uhf2 Pcb 8486348Z13-C Schematic Diagrams

    UHF2 PCB 8486348Z13-C Schematic Diagrams UHF2 PCB 8486348Z13-C Schematic Diagrams D301 C488 C465 C458 R480 C454 S444 C513 C480 J471 R470 R473 R264 U451 R254 FL54 R496 L265 L255 C470 R253 C257 C267 C473 R481 C256 C302 R472 C489 C482 R522 L264 F301...
  • Page 186 UHF2 PCB 8486348Z13-C Schematic Diagrams C121 C124 R206 C206 C52 C53 D121 C220 C417 R416 R411 C136 U151 L121 C222 C134 C123 R434 L140 R502 R433 C122 R432 C135 C221 FL51 R150 R501 C223 L132 L141 C131 C224 C157 C158 R151 SH200 R154...
  • Page 187 UHF2 PCB 8486348Z13-C Schematic Diagrams UHF R2 USWB+ USWB+ USWB+ USWB+ TX_ENA TX_ENA PWR_SET TX_UHF_R2 PWR_SET DEMOD DEMOD RX_FE_UHF_R2 RX_BE BW_SEL BW_SEL IF_IN IF_OUT RX_IN RX_OUT CONTROLLER TX_INJ RSSI RSSI RX_INJ MOD_OUT MOD_IN PRESC PRESC 16_8_MHZ 16_8_MHZ RX_INJ SYNTH_UHF_R2 V_STEER V_STEER VCO_UHF_R2 SYNTH_CS...
  • Page 188 UHF2 PCB 8486348Z13-C Schematic Diagrams FE_5R 5.6K UHF R2 Front End 390pF SH40 SHIELD SHIELD UMT1 390pF 390pF 22nH 5.6K 0.1uF C521 4.2V C523 1.5K FE_IF_OUT 390pF 5.1pF C522 0.45pF IF_OUT 680nH 9.1pF 6.7% 6.2pF 7.5pF 5.1pF 8.2pF 0.5pF 0.79V RX_IN 1.6% 1.3%...
  • Page 189 UHF2 PCB 8486348Z13-C Schematic Diagrams RX Back End (Overtone) U52-1 FL53 TC7W04F CFWC455E 0.1uF OUT 2 U52-2 100K TC7W04F IF_BAND_SEL 5V for 25kHz BW_SE L 0V for 12.5kHz 0.1uF FL54 CFWC455G 1 IN 47pF U52-3 3.3K SH50 SH52 TC7W04F SHIELD SHIELD U52-4 2.4K...
  • Page 190 UHF2 PCB 8486348Z13-C Schematic Diagrams UHF R2 Synthesizer FN_V_SF 4.5V V_SF SH200 SH201 SHIELD SHIELD C233 C231 C232 R230 R247 1000pF 0.1uF 4.7uF FN_LOCK LOCK WARP 25 LOCK: 3V C204 INDMULT 16 UNLOCK: 0V SFOUT 28 470pF ADAPTSW 46 CCOMP LOCK IADAPT 45 FN_V_STEER...
  • Page 191 UHF2 PCB 8486348Z13-C Schematic Diagrams UHF R2 VCO V_SF VCO_VSF L270 R273 R277 4.5V V_S F 220nH C292 C274 C270 C285 R284 L282 390pF 0.1uF VCO_3V 15nH 390pF 0.1uF L272 220nH SH250 SH251 SH253 SHIELD SHIELD SHIELD C272 L292 0.1uF 15nH C273 R271...
  • Page 192 4-10 UHF2 PCB 8486348Z13-C Schematic Diagrams UHF R2 Tx PA_USWB+ USWB+ PA_TX_EN A TX_ENA C170 390pF Q171 Q170 EMB10 C171 390pF SH100 SHIELD C157 C154 R152 0.1uF 390pF 100K C155 R158 C151 R153 U151 100K 1.5K 390pF C150 0.1uF C156 57R01 390pF Q150...

  • Page 193: Uhf2 Pcb 8486348Z13-C Parts List

    UHF2 PCB 8486348Z13-C Parts List 4-11 UHF2 PCB 8486348Z13-C Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Parts List Part No. Part No. Part No. Not_Placed CAP, 10pF C107 Not_Placed CAP, 27pF C204 2113743L09 CAP, 470pF Circuit Motorola Description Part No.
  • Page 194 4-12 UHF2 PCB 8486348Z13-C Parts List Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C263 2109445U19 CAP, 4.7pF C334 2311049A57 CAPP, 10uF C456 2113743E20 CAP, 0.1uF C504 2113743L17...
  • Page 195 UHF2 PCB 8486348Z13-C Parts List 4-13 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. FL54 9180469V03 CFWC455G L264 2484562T11 IDCTR, 12.5nH 0662057N09 RES, 27K R121 0662057C55 RES, 150...
  • Page 196 SH52 2686424Z01 SHIELD Y202 Not_Placed 45J68 R421 0662057V27 RES, 100K R489 0662057A96 RES, 91K SH100 2686418Z01 SHIELD * Motorola Depot Servicing only R422 0662057N23 RES, 100K R490 Not_Placed RES, 2.2K SH200 2686424Z01 SHIELD R423 0662057N23 RES, 100K R491 0662057M01 RES, 0...
  • Page 197 Commercial Series CP140/CP160/CP180 Portable Radios UHF3 (465-495MHz) Service Information Issue: December 2003...
  • Page 198 Accordingly, any copyrighted Motorola computer programs contained in the Motorola products described in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola...
  • Page 199 Table of Contents Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 CP140/CP160/CP180 Model Chart ..............1-1 2.0 Technical Specifications ..................1-2 Chapter 2 THEORY OF OPERATION 1.0 Introduction ......................2-1 2.0 UHF3 (465-495MHz) Receiver ................2-1 2.1 Receiver Front-End ..................2-2 2.2 Receiver Back-End..................2-3 3.0 UHF3 (465-495MHz) Transmitter.................2-4 3.1 Transmitter Power Amplifier ................2-4...

  • Page 201: Chapter 1 Model Chart And Technical Specifications

    CP140/CP160/CP180 Series, UHF3, 465-495 MHz Model Description MDH65SDC9AA2AN CP140, 465-495 MHz, 4 W, 16 Ch. Non-Display Model MDH65SDF9AA3AN CP160, 465-495 MHz, 4 W, 32 Ch. Limited Keypad Model MDH65SDH9AA4AN CP180, 465-495 MHz, 4W, 64 Ch. Full Keypad Model Item Description PMUE1978_...

  • Page 202: Technical Specifications

    MODEL CHART AND TECHNICAL SPECIFICATIONS Technical Specifications Data is specified for +25°C unless otherwise stated. General UHF3 Frequency: 465-495 MHz Channel Capacity: 16, 32, or 64 Channels 7.5 Volts ±20% Power Supply: Dimensions with: High Capacity Li-Ion battery 130.5mm H x 62mm W x 45mm D NiMH FM, battery 130.5mm H x 62mm W x 45mm D NiMH Std battery...
  • Page 203 Technical Specifications Transmitter Specifications UHF3 RF Output High NiMH @ 7.5V: Frequency: 465-495 MHz Channel Spacing: 12.5/20/25 kHz Freq. Stability: 0.00025% (-30°C to +60°C) Spurs/Harmonics: -36 dBm < 1 GHz -30 dBm > 1 GHz Audio Response: +1, -3 dB (from 6 dB/oct.
  • Page 204 MODEL CHART AND TECHNICAL SPECIFICATIONS...

  • Page 205: Chapter 2 Theory Of Operation

    Chapter 2 THEORY OF OPERATION Introduction This Chapter provides a detailed theory of operation for the UHF circuits in the radio. Schematic diagrams and board layout diagrams are included in Chapter 4 in this Section of the manual. UHF (465-495MHz) Receiver The UHF receiver covers the range of 465-495 MHz and provides switchable IF bandwidth for use with 20/25/30 kHz or 12.5 kHz channel spacing systems.

  • Page 206: Receiver Front-End

    THEORY OF OPERATION Receiver Front End Incoming RF signals from the antenna are first routed through the harmonic filter and antenna switch, part of the transmitter circuitry, before being applied to the receiver front end. The receiver front end consists of a preselector filter, RF amplifier, an interstage filter, and a double-balanced first mixer.

  • Page 207: Receiver Back-End

    UHF (465-495MHz) Receiver Receiver Back End The receiver back end is a dual conversion design. High IF selectivity is provided by FL51, a 4-pole fundamental mode 44.85 MHz crystal filter with a minimum 3 dB bandwidth of ±6.7 kHz, a maximum 20 dB bandwidth of + 12.5 kHz, and a maximum insertion loss of 3.5 dB.

  • Page 208: Transmitter Power Amplifier

    THEORY OF OPERATION UHF Transmitter The UHF transmitter covers the range of 465-495 MHz. Depending on model, the output power of the transmitter is either switchable on a per-channel basis between high power (4 watts) and low power (1 watt), or is factory preset to 2 watts. The transmitter is divided into four major blocks as shown in Figure 2-2.

  • Page 209: Harmonic Filter

    UHF Transmitter Harmonic Filter The harmonic filter consists of components C130-C136 and L130-L132. The harmonic filter is a seven-pole Chebychev low-pass configuration, optimized for low insertion loss, with a 3 dB frequency of approximately 655 MHz and typically less than 0.8 dB insertion loss in the passband. Antenna Matching Network The harmonic filter presents a 50Ω...
  • Page 210 THEORY OF OPERATION UHF Frequency Generation Circuitry The frequency generation system, shown in Figure 2-3, is composed of two circuit blocks, the Fractional-N synthesizer IC U201, the VCO/Buffer IC U251, and associated circuitry. Figure 2-4 shows the peripheral interconnect and support circuitry used in the synthesizer block, and Figure 2-5 details the internal circuitry of the VCOBIC and its interconnections to the surrounding components.

  • Page 211: Fractional-N Synthesizer

    UHF Frequency Generation Circuitry Fractional-N Synthesizer The Fractional-N synthesizer, shown in Figure 2-4, uses a 16.8 MHz crystal (Y201) to provide the reference frequency for the system. External components C201-C203, R202 and D201 are also part of the temperature-compensated oscillator circuit. The dc voltage applied to varactor D201 from U201 pin 25 is determined by a temperature-compensation algorithm within U201, and is specific to each crystal Y201, based on a unique code assigned to the crystal that identifies its temperature characteristics.

  • Page 212: Voltage Controlled Oscillator (Vco)

    THEORY OF OPERATION Voltage Controlled Oscillator (VCO) The VCOBIC (U251), shown in Figure 2-5, in conjunction with the Fractional-N synthesizer (U201) generates RF in both the receive and the transmit modes of operation. The TRB line (U251 pin 19) determines which oscillator and buffer are enabled. A sample of the RF signal from the enabled oscillator is routed from U251 pin 12 through a low pass filter, to the prescaler input of the synthesizer IC (U201 pin 32).

  • Page 213: Chapter 3 Troubleshooting Tables

    Chapter 3 TROUBLESHOOTING TABLES This section contains detailed troubleshooting tables. These tables should be used as a guide in determining the problem areas. They are not a substitute for knowledge of circuit operation and astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions in the theory of operation sections prior to troubleshooting a radio.
  • Page 214 TROUBLESHOOTING TABLES Symptom Possible Causes Procedure Corrective Action No Audio 1. Synthesizer out of lock Verify U201-4 is at 3V dc. Troubleshoot synthesizer/VCO circuits. 2. Defective IFIC Verify audio is present at U51-8. Check Q70, Y70, U51. 3. RX audio buffer fault Verify audio is present at U451-2.

  • Page 215: Troubleshooting Table For Synthesizer

    Troubleshooting Table for Synthesizer Troubleshooting Table for Synthesizer Symptom Possible Causes Procedure Corrective Action Synthesizer Out of 1. VCO fault Verify oscillator is working, check RF Check VCO tank components Lock (RX mode level at U251-10 per schematic. connected to U251-5 and 6. only) Check dc voltages at U251 pin 2 Check for shorts/opens, replace...

  • Page 216: Troubleshooting Table For Transmitter

    TROUBLESHOOTING TABLES Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action No Transmit (no 1. PTT switch defective. Verify U401-71 goes low when PTT Replace PTT switch S441. TX LED indication) is pressed. 2. EXT MIC PTT fault Verify U401-72 goes low when J471- Check/replace Q470, L471 etc.
  • Page 217 Troubleshooting Table for Transmitter Symptom Possible Causes Procedure Corrective Action Poor TX range, 1. RF test jack defective Verify continuity of J140 pins 3 and 4 Replace J140. conducted power in RX mode only. 2. Antenna matching net- Visually inspect components C140- Repair/replace if necessary.

  • Page 218: Troubleshooting Table For Board And Ic Signals

    TROUBLESHOOTING TABLES Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) RF input 44.85 MHz 1.20 IFIC RF input decoupling 1.20 2nd LO osc output 4.02 2nd LO osc input 4.60 RSSI output 0.74 (no received signal) 4.70 Audio feedback...
  • Page 219 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U110 RF input (TX mode) RF Power Amp Vgg (gate bias) 2.65 (typ) (TX mode) 6.59 (TX mode) RF output Do not measure Ground U150 Unit 1 output 4.20 (typ) (TX mode)
  • Page 220 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U201 Ref osc XTAL2 Freq Synthesizer Ref osc warp output 3.00 Superfilter cap 4.48 Superfilter base (NU) 3.76 Superfilter output 4.52 Superfilter input 4.96 Prescaler input 1.97 Prescaler ground Prescaler Vdd 2.99 Prescaler Vref (NU) 1.97...
  • Page 221 Troubleshooting Table for Board and IC Signals IC Designator Pin Function DC Voltage Comments (Condition) U251 Prescaler output 2.26 VCO / Buffer TX switch output (NU) 0.06 Vcc_BUFFERS 3.00 TX VCO emitter (RX mode) TX VCO base (RX mode) GND_LOGIC Vcc_LOGIC 3.00 TRB input...
  • Page 222 3-10 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PB1_ADDR9 3.05 Microprocessor PB2_ADDR10 0.16 3.23 PBO_ADDR8 3.05 PB5_ADDR13 0.13 PG1_XA14 0.20 PG4_XA17 3.17 PG5_XA18 PG3_XA16 3.21 PG2_XA15 0.30 PB4_ADDR12 0.22 PF7_ADDR7 3.03 PF6_ADDR6 3.08 PF5_ADDR5 3.06 PF4_ADDR4 0.16 PF3_ADDR3 0.26...
  • Page 223 Troubleshooting Table for Board and IC Signals 3-11 IC Designator Pin Function DC Voltage Comments (Condition) U401 PH1_PW2 3.00 Microprocessor PH0_PW1 3.23 Synth chip select XIRQ 3.00 1.48 RX enable 0.01 TX enable 3.23 Green LED enable Red LED enable 2.98 Lock detect from U201-4 MODB_VSTBY...
  • Page 224 3-12 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U401 PA3_IC4_OC5_OC1 3.00 Microprocessor PA4_OC4_OC1 Squelch detect input PA5_OC3_OC1 Channel activity input PA6_OC2_OC1 PA7_PA1_OC1 VSSR VDDR 3.23 ECLK (NU) 1.60 EXTAL 1.70 Clock from U451-28 XTAL 1.40 Not used VDDSYN XFC (NU) RESET...
  • Page 225 Troubleshooting Table for Board and IC Signals 3-13 IC Designator Pin Function DC Voltage Comments (Condition) U404 3.17 Flash ROM 0.30 0.22 3.03 3.08 3.06 0.24 3.08 3.05 3.05 0.69 0.94 1.08 0.78 0.59 0.66 0.67 0.75 EN_CE 3.01 From U401-38 0.16 EN_OE From U401-86...
  • Page 226 3-14 TROUBLESHOOTING TABLES IC Designator Pin Function DC Voltage Comments (Condition) U451 GCB1 general purpose output ASFIC_CMP GCB0 general purpose output 3.00 BW select (25 kHz mode) Squelch channel activity output To U401-84 Squelch detect digital output To U401-83 PL/low speed data I/O 1.50 High speed data I/O 3.00...
  • Page 227 Troubleshooting Table for Board and IC Signals 3-15 IC Designator Pin Function DC Voltage Comments (Condition) U480 Unit 1 output 2.48 Dual Opamp Unit 1 (-) input 2.48 Unit 1 (+) input 2.46 Ground Unit 2 (+) input 0.28 Unit 2 (-) input 0.29 Unit 2 output 4.96...
  • Page 228 3-16 TROUBLESHOOTING TABLES...

  • Page 229: Allocation Of Schematics And Circuit Boards

    Chapter 4 UHF3 PCB/SCHEMATICS/PARTS LISTS Allocation of Schematics and Circuit Boards UHF2 (465-495MHz) The UHF circuits are contained on the printed circuit board (PCB) which also contains the Controller circuits. This Chapter shows the schematics for the UHF circuits, the Controller circuits are contained in Section 2 of this manual.
  • Page 230 UHF3 PCB/SCHEMATICS/PARTS LISTS...

  • Page 231: Uhf3 Pcb 8486634Z02-O Schematic Diagrams

    UHF3 PCB 8486634Z02-O Schematic Diagrams UHF3 PCB 8486634Z02-O Schematic Diagrams D301 C488 C465 R480 C458 C454 C513 S444 C480 J471 R470 R473 R264 U451 R254 FL54 R496 L255 L265 C470 R253 C267 C473 R481 R472 C256 C257 C302 C489 C482 R522 L264 F301...
  • Page 232 UHF3 PCB 8486634Z02-O Schematic Diagrams C121 C124 R206 C206 C52 C53 R416 C220 D121 C417 C136 U151 R411 L121 C222 C134 R434 C123 R502 R433 C122 R432 C135 C141 C221 FL51 R150 R501 C223 C157 L132 L141 C131 C224 C158 C159 R151 SH200...
  • Page 233 UHF3 PCB 8486634Z02-O Schematic Diagrams UHF R3 USWB + USWB + USWB+ USWB TX_ENA TX_ENA PWR_SET TX_UHF_R3 PWR_SET DEMOD DEMOD RX_FE_UHF_R3 RX_BE CONTROLLER BW_SEL BW_SEL IF_IN IF_OUT RX_IN RX_OUT TX_INJ RSSI RSSI RX_INJ MOD_OUT MOD_IN PRESC PRESC 16_8_MHZ 16_8_MHZ RX_INJ VCO_UHF_R3 V_STEER V_STEER...
  • Page 234 UHF3 PCB 8486634Z02-O Schematic Diagrams UHF R3 Front End FE_5R 5.6K 390pF SH40 SHIELD SHIELD UMT1 390pF 390pF 22nH 0.1uF 5.6K C521 4.2V C523 3.7% 1.2K 390pF 2.7pF C522 0.5pF IF 1 0.5pF 0.79V RX_IN 1.1% 1.25% 1.3% 2.3% 1.6% 4.3pF 6.2pF 390pF...
  • Page 235 UHF3 PCB 8486634Z02-O Schematic Diagrams RX Back End (Overtone) U52-1 FL53 TC7W04F CFWC455E 0.1uF OUT 2 U52-2 100K TC7W04F IF_BAND_SEL 5V for 25kHz BW_SE L 0V for 12.5kHz 0.1uF FL54 CFWC455G 1 IN 47pF U52-3 3.3K SH50 SH52 TC7W04F SHIELD SHIELD U52-4 2.4K...
  • Page 236 UHF3 PCB 8486634Z02-O Schematic Diagrams UHF R3 Synthesizer FN_V_SF 4.5V V_SF C231 C232 C233 R230 R247 1000pF 0.1uF 4.7uF SH201 SH200 SHIELD SHIELD FN_LOCK LOCK LOCK: 3V C204 31 NC3 UNLOCK: 0V WARP 470pF 29 NC2 INDMULT 17 NC1 SFOUT ADAPTSW 42 CCOMP LOCK...
  • Page 237 UHF3 PCB 8486634Z02-O Schematic Diagrams UHF R3 VCO V_SF VCO_VSF L270 R273 R277 4.5V V_S F 220nH C270 C274 VCO_3V C292 390pF 0.1uF 390pF L272 C285 C272 0.1uF 220nH SH253 SH250 SH251 0.1uF SHIELD SHIELD SHIELD L282 18nH L292 R284 C273 15nH R272...
  • Page 238 4-10 UHF3 PCB 8486634Z02-O Schematic Diagrams UHF R3 Tx PA_USWB+ USWB+ PA_TX_EN A TX_ENA C170 390pF Q171 Q170 EMB10 SH100 SHIELD C525 390pF C172 R120 C157 C154 390pF 0.1uF 390pF R152 100K 1% R121 C160 R158 C151 R153 U151 100K 390pF 1.5K C150...

  • Page 239: Uhf3 Pcb 8486634Z02-O Parts List

    UHF3 PCB 8486634Z02-O Parts List 4-11 UHF3 PCB 8486634Z02-O Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Parts List Part No. Part No. Part No. Circuit Motorola Not_Placed CAP, 10pF C107 Not_Placed CAP, 27pF C205 Not_Placed CAP, 2.7pF Description Part No.
  • Page 240 4-12 UHF3 PCB 8486634Z02-O Parts List Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C264 2109445U14 CAP, 3.0pF C400 Not_Placed CAP, .022uF C457 2113743E20 CAP, 0.1uF C505 2113743L17...
  • Page 241 UHF3 PCB 8486634Z02-O Parts List 4-13 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. FL53 9180469V05 CFWC455E L262 2413926N17 IDCTR, 27nH 0662057M92 RES, 5.6K R120 0662057C55 RES, 150...
  • Page 242 SH52 2686424Z01 SHIELD Y202 Not_Placed 45J68 R423 0662057N23 RES, 100K R491 0662057M01 RES, 0 SH100 2686418Z01 SHIELD * Motorola Depot Servicing only R424 0662057V35 RES, 200K R492 0662057N08 RES, 24K SH200 2686424Z01 SHIELD R425 0662057V27 RES, 100K R493 0662057N35 RES, 330K...

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